<template>
  <div class="box" ref="box">
    <div class="left">
        <!--左侧div内容-->
        哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈
    </div>
    <div class="resize" title="收缩侧边栏">
        ⋮
    </div>
    <div class="mid">
        <!--右侧div内容-->
    </div>
</div>
</template>
<script>
export default {
  mounted () {
    this.dragControllerDiv();
  },
  methods: {
    dragControllerDiv: function () {
        var resize = document.getElementsByClassName('resize');
        console.log(resize)
        var left = document.getElementsByClassName('left');
        var mid = document.getElementsByClassName('mid');
        var box = document.getElementsByClassName('box');
        // for (let 0 = 0; 0 < resize.length; 0++) {
            // 鼠标按下事件
            resize[0].onmousedown = function (e) {
                //颜色改变提醒
                resize[0].style.background = '#818181';
                var startX = e.clientX;
                console.log(resize[0].offsetLeft)
                console.log(startX)
                resize[0].left = resize[0].offsetLeft;
                // console.log(resize[0].left)
                // 鼠标拖动事件
                document.onmousemove = function (e) {
                    var endX = e.clientX;
                    var leftWidth = resize[0].left + (endX - startX); // （endx-startx）=移动的距离。resize[0].left+移动的距离=左边区域最后的宽度
                    var rightWidth = box[0].clientWidth - resize[0].offsetWidth; // 容器宽度 - 左边区域的宽度 = 右边区域的宽度

                    if (leftWidth < 150){
                        leftWidth = 10; // 左边区域的最小宽度为32px
                    } 
                    
                    if (leftWidth > rightWidth - 150){
                        leftWidth = rightWidth - 150; //右边区域最小宽度为150px
                    } 
                    resize[0].style.left = leftWidth; // 设置左侧区域的宽度

                    // for (let 0 = 0; 0 < left.length; 0++) {
                        left[0].style.width = leftWidth + 'px';
                        mid[0].style.width = (box[0].clientWidth - leftWidth - 10) + 'px';
                    // }
                };
                // 鼠标松开事件
                document.onmouseup = function (evt) {
                    //颜色恢复
                    resize[0].style.background = '#d6d6d6';
                    document.onmousemove = null;
                    document.onmouseup = null;
                    resize[0].releaseCapture && resize[0].releaseCapture(); //当你不在需要继续获得鼠标消息就要应该调用ReleaseCapture()释放掉
                };
                resize[0].setCapture && resize[0].setCapture(); //该函数在属于当前线程的指定窗口里设置鼠标捕获
                return false;
            // };
        }
    },
  }
}
</script>

<style scoped>
/* 拖拽相关样式 */
    /*包围div样式*/
    .box {
        width: 100%;
        height: 100%;
        margin: 1% 0px;
        overflow: hidden;
        box-shadow: -1px 9px 10px 3px rgba(0, 0, 0, 0.11);
    }
    /*左侧div样式*/
    .left {
        width: calc(32% - 10px);  /*左侧初始化宽度*/   
        /* height: 100%; */
        height: 40px;
        background:yellowgreen;
        float: left;
    }
    /*拖拽区div样式*/
    .resize {
        cursor: col-resize;
        float: left;
        position: relative;
        top: 45%;
        background-color: #d6d6d6;
        border-radius: 5px;
        margin-top: -10px;
        width: 10px;
        height: 50px;
        background-size: cover;
        background-position: center;
        /*z-index: 99999;*/
        font-size: 32px;
        color: white;
    }
    /*拖拽区鼠标悬停样式*/
    .resize:hover {
        color: #444444;
    }
    /*右侧div'样式*/
    .mid {
        float: left;
        width: 68%;   /*右侧初始化宽度*/
        height: 40px;
        background: rgb(228, 110, 110);
        box-shadow: -1px 4px 5px 3px rgba(0, 0, 0, 0.11);
    }
</style>


